-PHOTO TAKEN 22JUN06- A tourist walks to a kiosk used to overlook a park in Tengeri Desert on the outskirts in Zhongwei, China's Ningxia Hui Autonomous Region, June 22, 2006. China, which is plagued by sandstorms every spring, has embarked on a campaign to plant billions of trees and says it is slowing the rate of desertification, but leading environmentalists said problem was far from under control.